bolt/test/X86/issue20.s

   1 # This reproduces issue 20 from our github repo
   2 #  "BOLT crashes when removing unreachable BBs that are a target
   3 #   in a JT"
   4
   5 # REQUIRES: system-linux
   6
   7 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
   8 # RUN:   %s -o %t.o
   9 # RUN: %clang %cflags -no-pie %t.o -o %t.exe
  10 # RUN: llvm-bolt %t.exe --relocs=0 --jump-tables=move --print-finalized \
  11 # RUN:    -o %t.out | FileCheck %s
  12
  13 # CHECK-NOT: BOLT-INFO: UCE removed {{.*}} blocks and {{.*}} bytes of code
  14 # CHECK: Binary Function "main"
  15 # CHECK:      .LFT{{.*}} (2 instructions, align : 1)
  16 # CHECK-NEXT:   CFI State : 0
  17 # CHECK-NEXT:     00000004:   andq
  18 # CHECK-NEXT:     00000008:   jmpq
  19 # CHECK-NEXT:   Successors: .Ltmp{{.*}}, .Ltmp{{.*}}, .Ltmp{{.*}}, .Ltmp{{.*}}
  20
  21
  22   .text
  23   .globl main
  24   .type main, %function
  25   .size main, .Lend1-main
  26 main:
  27   xorq %rax, %rax
  28   retq
  29   andq $3, %rdi
  30   jmpq *jumptbl(,%rdi,8)
  31
  32 .Lbb1:
  33   movl $0x1, %eax
  34   jmp .Lexit
  35 .Lbb2:
  36   movl $0x2, %eax
  37   jmp .Lexit
  38 .Lbb3:
  39   movl $0x3, %eax
  40   jmp .Lexit
  41 .Lbb4:
  42   movl $0x4, %eax
  43 .Lexit:
  44   retq
  45 .Lend1:
  46
  47   .section .rodata
  48   .globl jumptbl
  49 jumptbl:
  50   .quad .Lbb1
  51   .quad .Lbb2
  52   .quad .Lbb3
  53   .quad .Lbb4